详细异常信息：

Exception in thread "elasticsearch[_client_][management][T#1]" java.lang.AbstractMethodError: org.elasticsearch.transport.TcpTransport.sendMessage(Ljava/lang/Object;Lorg/elasticsearch/common/bytes/BytesReference;Ljava/lang/Runnable;)V

at org.elasticsearch.transport.TcpTransport.internalSendMessage(TcpTransport.java:1111)

at org.elasticsearch.transport.TcpTransport.sendRequestToChannel(TcpTransport.java:1093)

at org.elasticsearch.transport.TcpTransport.executeHandshake(TcpTransport.java:1600)

at org.elasticsearch.transport.TcpTransport.openConnection(TcpTransport.java:568)

at org.elasticsearch.transport.TcpTransport.openConnection(TcpTransport.java:114)

at org.elasticsearch.transport.TransportService.openConnection(TransportService.java:351)

at org.elasticsearch.client.transport.TransportClientNodesService$SniffNodesSampler$1.doRun(TransportClientNodesService.java:506)

at org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingAbstractRunnable.doRun(ThreadContext.java:638)

at org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)

at java.lang.Thread.run(Thread.java:748)

 

原因是：maven的jar包管理问题

解决方法：

<dependency> 

    <groupId>org.elasticsearch</groupId> 

    <artifactId>elasticsearch</artifactId> 

    <version>5.6.0</version> 

</dependency> 

<dependency> 

    <groupId>org.elasticsearch.client</groupId> 

    <artifactId>transport</artifactId> 

    <version>5.6.0</version> 

    <exclusions> 

        <exclusion> 

        <groupId>org.elasticsearch.plugin</groupId> 

        <artifactId>transport-netty4-client</artifactId> 

        </exclusion> 

    </exclusions> 

</dependency>

<dependency> 

    <groupId>org.elasticsearch.plugin</groupId>

    <artifactId>transport-netty4-client</artifactId> 

    <version>5.5.3</version> 

</dependency>